As to a telecine video signal (Sv), in a telecine video signal detector (Dtp) for detecting a scene-change part (SC) and deciding whether successive telecine conversion has been carried out, a motion detector (3) detects a motion between video signals (Sv) one field apart from each other; a first statistical processing unit (4) accumulates detection results (Sm) for one field; a first telecine decision unit (5) decides whether the field represents telecine-converted video; the second statistical processing unit (6) detects statistical information (Ss2) of the input signal (Sv); a scene-change detector (8) detects a scene-change in the output (Ss2) from the second statistical processing unit (6); a second telecine decision unit (9) decides field continuity from a detection result (Ssc) of the scene-change detector (8) and a result (St1) of the first decision unit (5); and then an AND circuit (10) carries out an AND operation on outputs (St1, St2) from the first and second decision units (5, 9).
Legal claims defining the scope of protection, as filed with the USPTO.
1. In a telecine video signal obtained through conversion into an interlaced signal by a 2-3 pulldown scheme, a telecine video signal detector for detecting, if part of the telecine signal is missing, the missing part of the telecine signal and deciding whether successive telecine conversion has been carried out, the detector comprising: motion detection means for detecting a motion of an image between a first field of said telecine video signal and a second field at least one or more fields apart from the first field, and generating a motion detection signal; first statistical processing means for accumulating said motion detection signals for one field, and generating a first statistical signal; first telecine decision means for deciding, based on said first statistical signal, whether said first field represents a telecine-converted image, and generating a first telecine decision signal; second statistical processing means for carrying out a histogram operation with respect to said telecine video signal for one field, and generating a second telecine decision signal including video statistical information; 1-field delay means for delaying said second statistical signal by at least one field, and generating a delayed second statistical signal; scene-change detection means for detecting, based on said second statistical signal, said delayed second statistical signal, and a predetermined threshold, a scene-change in said telecine video, signal and generating a scene-change detection signal; second telecine decision means for deciding, based on said scene-change detection signal and the first telecine decision signal, whether said first field represents an image produced through successive telecine conversion, and generating a second telecine decision signal; and AND operation means for carrying out an AND operation on said first telecine decision signal and the second telecine decision signal, wherein whether said first field represents the image produced through successive telecine conversion is indicated based on a result of the AND operation.
2. The telecine video signal detector as claimed in claim 1 , wherein said predetermined threshold is two or more, and said scene-change detection means adaptively detects the scene-change.
3. The telecine video signal detector as claimed in claim 1 , herein said second statistical processing means outputs a plurality of second statistical signals, said scene-change detection means comprises: a plurality of scene-change detection circuits for generating a plurality of scene-change detection signals corresponding to said plurality of second statistical signals; and OR operation means provided with said plurality of scene-change detection signals for carrying out an OR operation, and the scene-change of said video signal is detected with a result of the OR operation on said plurality of scene-change detection signals.
4. The telecine video signal detector as claimed in claim 1 , wherein said first decision means comprises 5-field delay means for delaying said first statistical signal by five fields, and generates a timing signal, and the detector comprises selection means for selectively outputting one of said first telecine decision signal and the second telecine decision signal based on said timing signal, and successively decides whether said video signal represents video produced through telecine conversion.
5. The telecine video signal detector as claimed in claim 4 , further comprising: 2-field delay means for further delaying said delayed second statistical signal by two fields and generating a delayed third statistical signal; first switch means for selectively inputting, based on said first telecine decision signal, one of said motion detection signal and said video signal to said first statistical processing means by a unit of field; and second switch means for outputting a result of accumulation of said motion detection signals for one field and a result of a statistical process on the input signal for one field that are carried out only by the first statistical processing means with a help of said first switch means switching an input to said first statistical processing means, and switching, based on an output from the scene-change detection means, a destination to which the first statistical signal is provided between said first telecine decision means and said scene-change detection means.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
January 11, 2001
June 18, 2002
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